Color filter substrate and touch display device

ABSTRACT

The present disclosure provides a color filter substrate, including: a base, a wiring layer disposed on the base, and a color filter layer disposed on the wiring layer, wherein the color filter layer includes a plurality of color filters, the wiring layer includes a plurality of wirings, the plurality of wirings extend along a first direction and an edge of each of the wirings is in a non-straight line shape in the first direction.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Application No.201410468464.5, filed Sep. 15, 2014, which is herein incorporated byreference in its entirety.

TECHNICAL FIELD

The present application relates to the field of touch displaytechnologies, in particular to a color filter substrate provided with awiring, and a touch display device.

BACKGROUND

In recent years, touch panels have been widely used. A touch screenhaving a touch panel, which is also referred to as a touch controlscreen, is an inductive display device which can receive a touchoperation to generate an input signal. As the latest input device, thetouch panel currently represents the simplest and the most convenientand natural human-machine interaction manner. A huge amount of the touchpanels have been applied to electronic products for consumption,communication and computers, for example, to game machines, smartphonesand tablet computers to function as input/output interfaces of theelectronic products. Display parts of the electronic products aregenerally touch display devices formed by touch panels and displaypanels, and can allow a user to input an action to be performed byclicking with a finger or a touch pen according to displayed functionoptions, as such, inputs can be performed without other conventionalinput devices (such as buttons, keyboards or joysticks), thussignificantly improving convenience of input.

In order to achieve lighter and thinner touch display devices, a touchstructure is directly integrated into a display device in the relatedart, for example, by integrating the touch structure into a color filtersubstrate in the display device. However, there is a problem in therelated art that defects such as rupture of the film forming a colorfilter layer of the color filter substrate occur due to the presence ofthe touch structure.

SUMMARY

The present disclosure provides a color filter substrate, including: abase, a wiring layer disposed on the base, and a color filter layerdisposed on the wiring layer, wherein the color filter layer includes aplurality of color filters, the wiring layer includes a plurality ofwirings, the plurality of wirings extend along a first direction and anedge of each of the wirings is in a non-straight line shape in the firstdirection.

The present disclosure further provides a touch display device,including the color filter substrate.

While multiple embodiments are disclosed, still other embodiments of thepresent disclosure will become apparent to those skilled in the art fromthe following detailed description, which shows and describesillustrative embodiments of the disclosure. Accordingly, the drawingsand detailed description are to be regarded as illustrative in natureand not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic top view of the color filter substrate, accordingto embodiments of the disclosure;

FIG. 2 is an enlarged schematic view of the wirings shown in FIG. 1,according to embodiments of the disclosure;

FIG. 3 is a schematic top view of the color filter substrate having atouch structure in the related art;

FIG. 4 is a schematic diagram of a color filter layer of the color filmsubstrate upon its film formation in the related art;

FIG. 5 is a schematic top view of the color filter substrate, accordingto embodiments of the disclosure;

FIG. 6 is a cross-sectional view of the color filter substrate along aline B1-B2 in FIG. 5, according to embodiments of the disclosure;

FIG. 7 is a schematic diagram of the wirings, according to embodimentsof the disclosure;

FIG. 8 is a schematic diagram of the wirings, according to embodimentsof the disclosure; and

FIG. 9 is a schematic diagram of a color filter substrate, according toembodiments of the disclosure.

While the disclosure is amenable to various modifications andalternative forms, specific embodiments have been shown by way ofexample in the drawings and are described in detail below. Theintention, however, is not to limit the disclosure to the particularembodiments described. On the contrary, the disclosure is intended tocover all modifications, equivalents, and alternatives falling withinthe scope of the disclosure as defined by the appended claims.

DETAILED DESCRIPTION

Embodiments of the disclosure provide a color filter substrate,including: a base, a wiring layer disposed on the base and a colorfilter layer disposed on the wiring layer, where the wiring layerincludes a plurality of wirings extending along a first direction, andthe plurality of wirings are in a non-straight line shape in the firstdirection.

Particularly, referring to FIG. 1 which is a schematic top view of thecolor filter substrate, according to embodiments of the disclosure andFIG. 2 which is an enlarged schematic view of the wirings shown in FIG.1, according to embodiments of the disclosure, the color filtersubstrate includes a base 101, and a touch structure disposed on thebase 101. The touch structure includes touch electrodes 102 and wirings103, where the wiring 103 is configured to transmit a touch signal, anend of the wiring 103 is connected to a corresponding touch electrode102, and the other end of the wiring 103 is connected with a touchsignal inputting terminal. The wiring 103 extends along the firstdirection, which is a direction Y in the first embodiment, i.e. thewiring 103 extends along the direction Y. An edge of the wiring 103 isin a non-straight line shape in the direction Y. In some embodiments,the edge of the wiring 103 is provided with a plurality of protrusions1031 and hence is in a non-straight line shape due to the existence ofthe plurality of protrusions 1031.

As described in the background, there is a problem in the related artthat a touch structure in a color filter substrate leads to the defectof the film for forming the color filter layer, this is due to the factthat the film for forming the color filter layer would be ruptured bythe edge of the wiring in the touch structure. Referring to FIG. 3 whichis a schematic top view of the color filter substrate having a touchstructure in the related art and FIG. 4 which is a schematic diagram ofa color filter layer of the color film substrate upon its film formationin the related art, the color filter substrate includes a base 001, anda touch structure disposed on the base 001, where the touch structureincludes touch electrodes 002 and wirings 003 extending along the firstdirection, and an edge of the wiring 003 is in a straight line shape.

The color filter substrate is manufactured by following processes. Abase 001 is provided; then a black matrix layer (not shown) having aplurality of openings is formed on the base 001; and a touch structureincluding the touch electrodes 002 and the wirings 003 is formed on theblack matrix layer, where an edge of the wiring 003 is in a straightline shape. Then, color filters respectively corresponding to theplurality of openings of the black matrix layer are formed.

In general, the color filter layer includes color filters of at leastthree colors, i.e. red color filters R, green color filters G and bluecolor filters B. The color filters of the three colors are sequentiallyformed on the base 001 through three coating and etching processes, anda coating direction of the color filter layer is perpendicular to anextending direction of the wiring 003. Particularly, an entire firstcolor filter layer is firstly coated on the base 001 along a seconddirection perpendicular to the first direction, where the first colorfilter layer may be a red color filter layer, and then the red colorfilter layer is etched to merely remain the partial red color filters;then an entire second color filter layer is coated on the base 001 alongthe second direction perpendicular to the first direction, where thesecond color filter layer may be a green color filter layer, and thenthe green color filter layer is etched to merely remain the partialgreen color filters; and then similarly, an entire third color filterlayer is coated on the base 001 along the second direction perpendicularto the first direction, where the third color filter layer may be a bluecolor filter layer, and then the blue color filter layer is etched tomerely remain the partial blue color filters.

Referring to FIG. 4, when forming the first color filters 004, thecoated first color filter layer would cover all of the wirings 003, andthen first color filters at locations where the second color filters andthe third color filters are to be disposed subsequently are etched awayfrom the first color filter layer, where the etching may be wet etching,and the first color filter layer is etched with etchant.

While the first color filter layer is etched, the etchant can also etchthe wirings 003, so that a sharp chamfer is formed at a side edge of thewiring 003 that is away from the base 001, as indicated by 0031, 0032,and 0033 in FIG. 4, for example. The edge of the wiring 003 extendingalong the first direction is like a long scraper knife due to theexistence of the sharp chamfers. When the second color filter layer iscoated along the second direction, liquid tension of the second colorfilter layer would be destroyed by the sharp chamfers, therefore thesecond color filter layer cannot be stuck at the sharp chamfers, anddefects such as rupture of the film forming the second color filterlayer likely occur when applying the second color filter layer.

In embodiments of the present disclosure, the edge of the wiring 103 isdesigned in a non-straight line shape to solve the problem that theliquid tension of the color filter layer is destroyed by wirings. Thewiring 103 extends along the first direction which is a direction Y. Theedge of the wiring 103 is provided with a plurality of protrusions 1031,and hence is in a polygonal line shape due to the existence of theplurality of protrusions 1031. Referring to FIG. 2, protrusions at theedge of the wiring 103 other than the protrusions are defined as concaveportions 1032. While etching the color filter layer, although sharpchamfers still would be formed at a side edge of the wiring 103 that isaway from the substrate 101, i.e. the wiring 103 has a trapezoidcross-section and a relatively short bottom edge of the trapezoidcross-section is in contact with the base 101, sharp edges of the samewiring 103 would be staggered relative to each other, i.e. sharp edgesof the protrusions 1031 are located outwardly, and sharp edges of theconcave portions 1032 are located inwardly, so that the sharp edges ofthe protrusions 1031 would not be connected with the sharp edges of theconcave portions 1032 to form a straight line. When a next color filterlayer is coated along the second direction, liquid material of the colorfilter layer can be stuck to the edge of the wiring 103 by the liquidtension or stickiness at the relatively small sharp edges, thereforedefects such as rupture of the film forming the next color filter layerwould not occur. The second direction is perpendicular to the firstdirection, and may be the direction X.

Preferably, the length of the protrusion 1031 in the direction Y iswithin a range from the length of one color filter to the length of fivecolor filters, and the appropriate length of the protrusion 1031 in thedirection Y enables material of the color filter layer to be stuck toedges of the wirings.

In some embodiments, the wiring 103 is made of transparent metal oxide,and the protrusions 1031 and the wirings 103 are made of the samematerial and are formed simultaneously.

Referring to FIG. 5 which is a schematic top view of the color filtersubstrate, according to embodiments of the disclosure, and FIG. 6 whichis a cross-sectional view of the color filter substrate along a lineB1-B2 in FIG. 5, according to embodiments of the disclosure, a pluralityof wirings 203 are formed on a base 201 and made of metal. The pluralityof wirings 203 extend along the first direction, and protrusions 2031are disposed at an edge of the wiring 203, where the protrusions 2031are also made of metal and formed in the same process as the wirings203. A black matrix layer 2011 is formed between the substrate 201 andthe wirings 203 as well as the protrusions 2031, where the wirings 203and the protrusions 2031 are shielded by the black matrix layer 2011 ina light transmitting direction. In integrating the touch structure intothe color filter substrate, in some embodiments, the wirings are formedof metal; in this case, the wirings and the protrusions need to beshielded and hence are arranged to overlap with the black matrix layerso as to prevent the touch structure from occupying a light permeableregion. Certainly, when being made of transparent metal oxide, thewirings and the protrusions may also be arranged to overlap with theblack matrix layer so as to ensure transmittance consistence.

In some embodiments, the protrusions are provided at both edges of thewiring. In some embodiments, protrusions are provided at one side of awiring adjacent to a first color filter, which is away from the firstcolor filter, and the other side of the wiring is covered by the firstcolor filter. Referring to FIG. 4, the wirings 003 are covered whencoating the film forming a first color filter layer; when forming thefirst color filter 004 by etching, one side of the wiring 003 adjacentto the first color filter 004 is still covered and protected by thefirst color filter 004 from being etched by etchant, therefore sharpchamfers would not be formed and protrusions are unnecessary at thisside of the wiring 003, so that only the other side of the wiring 003that is away from the first color filter 004 is provided withprotrusions.

Referring to FIGS. 7 and 8, which are schematic diagrams of the wiringsprovided by additional embodiments of the disclosure, the wiring 303 mayalso be in a curved shape or a polygonal line shape, which can preventsharp chamfers at an edge of the wiring from being aligned in a line,and prevent defects such as rupture of the film forming the color filterlayer when applying the color filter layer

Embodiments provide a touch display device, which includes the abovementioned color filter substrate.

It is noted that embodiments illustratively illustrate the structure ofthe wiring in the touch structure, and it should be understood by thoseskilled in the art that description of other known structures may beomitted or not given in detail. In the disclosure, the wiring on thecolor filter substrate can be applied to a self-capacitive structure ora mutual capacitive structure. The touch electrode may be a drivingelectrode or a sensing electrode, and the wiring may be a driving signaltransmitting wiring or a sensing signal transmitting wiring. Thedisclosure does not limit the type of the touch structure or the signaltransmitting wiring.

Referring to FIG. 9 which is a schematic diagram of a color filtersubstrate, according to embodiments of the disclosure, the color filtersubstrate includes a base 401 and a touch structure disposed on the base401, where the touch structure includes touch electrodes 402 and wirings403, and the wirings 403 are touch signal transmitting wirings andrespectively connected to corresponding touch electrodes 402.

The color filter substrate is divided into a display region 401 a and aperipheral region 401 b surrounding the display region 401 a. In thedisplay region 401 a, the wirings 403 extend along a second directionuntil to the peripheral region 401 b. In the peripheral region 401 b,the wirings 403 extend along a first direction perpendicular to thesecond direction. In some embodiments, the first direction isrepresented by a direction Y, and the second direction is represented bya direction X. An edge of the wiring 403 in the peripheral region 401 bis in a non-straight line shape in the direction Y. In some embodiments,the edge of the wiring 403 is provided with a plurality of protrusions4031, where the edge of the wiring 403 is in a non-straight line shapedue to the existence of the plurality of protrusions 4031.

The edge of the wiring 403 is provided with the plurality of protrusions4031 to reduce rupture risk of the film forming the color filters whencoating the film, as like in previously described embodiments, which isnot discussed repeatedly. Further, a portion of the wiring 403 thatextends along the first direction is arranged in the peripheral region.When coating the color filter layer along the second direction, thecolor filter layer contacts with a long edge of the wiring 403 extendingalong the first direction. The plurality of protrusions 4031 can reducethe rupture risk of the film forming the color filter layer, and theportion of the wiring 403 extending along the first direction isarranged in the peripheral region so that displaying would not beaffected even if there are a few ruptures of the film forming the colorfilter layer.

Particularly, in the peripheral region 401 b, a first color filter layeris further formed above the wirings 403. The first color filter layerrefers to a color filter layer firstly formed on the base 401 whenforming color filters. The wirings 403 in the peripheral region 401 bare covered by the first color filter layer, so that no sharp chamferwould be formed at an upper edge of the wiring 403 when etching thefirst color filter layer and subsequent color filter layers, thereforedefects such as rupture of the films forming color filters due to sharpchamfers of the upper edge of the wiring 403 would not occur.

Optionally, the wiring may be further in a polygonal line shape or acurved shape, so as to also prevent the sharp chamfers of the edge ofthe wiring from being aligned in a line, and prevent defects such asrupture of the films forming the color filter layers when applying thecolor filter layers.

Optionally, the wiring is made of metal or transparent metal oxide.

Optionally, the protrusions and the wirings are made of the samematerial and are formed in the same process.

In some embodiments, the length of the protrusion is within a range fromthe length of one color filter to the length of five color filters.

Embodiments of the disclosure further provide a touch display device,which includes the above mentioned color filter substrate.

It is noted that embodiments merely illustratively illustrate thestructure of the wiring in the touch structure, and it should beunderstood by those skilled in the art that the description of otherknown structures may be omitted or not given in detail.

It is obvious for those skilled in the art that various modificationsand variants can be made to the present disclosure without departing thespirit of the present disclosure. If these modifications and variants ofthe present disclosure fall into the scope of the claims and itsequivalent of the present disclosure, the present disclosure is alsointended to include these modifications and variants.

Various modifications and additions can be made to the exemplaryembodiments discussed without departing from the scope of the presentdisclosure. For example, while the embodiments described above refer toparticular features, the scope of this disclosure also includesembodiments having different combinations of features and embodimentsthat do not include all of the described features. Accordingly, thescope of the present disclosure is intended to embrace all suchalternatives, modifications, and variations as fall within the scope ofthe claims, together with all equivalents thereof.

We claim:
 1. A color filter substrate, comprising: a base; a blackmatrix layer disposed on the base; a wiring layer disposed on the blackmatrix layer and comprising a plurality of wirings; and a color filterlayer disposed on the wiring layer and comprising a plurality of colorfilters, wherein each of the plurality of wirings includes an extendingportion extending in a first direction and a plurality of protrusionsprojecting out from a side of the extending portion in a seconddirection, and wherein both of the first direction and the seconddirection are substantially perpendicular to a light transmittingdirection.
 2. The color filter substrate of claim 1, wherein theplurality of wirings are shielded by the black matrix layer in the lighttransmitting direction.
 3. The color filter substrate of claim 1,wherein, the extending portion has a trapezoid cross section and a shortbottom edge of the trapezoid cross section is disposed adjacent to thebase.
 4. The color filter substrate of claim 1, wherein, the wirings aretouch signal transmitting wirings and respectively connected tocorresponding touch electrodes.
 5. The color filter substrate of claim1, wherein the protrusion is shielded by the black matrix layer in thelight transmitting direction.
 6. The color filter substrate of claim 1,wherein, a length of the protrusion in the first direction is within arange from a length of one color filter to a length of five colorfilters.
 7. The color filter substrate of claim 1, wherein, the wiringis made of metal or transparent metal oxide.
 8. The color filtersubstrate of claim 1, further comprising a display region and aperipheral region, and the plurality of wirings extend along the firstdirection in the peripheral region.
 9. The color filter substrate ofclaim 1, wherein, the color filter layer is formed through three coatingprocesses and three etching processes, and the first direction isperpendicular to a coating direction of each coating process.
 10. Atouch display device, comprising the color filter substrate of claim 1.11. The color filter substrate of claim 1, wherein a thickness of theextending portion is substantially equal to a thickness of theprotrusion thereof.
 12. The color filter substrate of claim 1, whereinthe extending portion is straight.
 13. The color filter substrate ofclaim 1, wherein the second direction is substantially perpendicular tothe first direction.
 14. The color filter substrate of claim 1, whereinthe second direction is substantially perpendicular to the side of theextending portion.
 15. The color filter substrate of claim 1, whereinthe extending portion and one of the plurality of protrusions thereofenclose a hollow area.
 16. The color filter substrate of claim 15,wherein the hollow area exposes at least one color filter.